Oil saver



F. A. DEZARN July 6 1926.

OIL SAVER Filed August 11 1925 m a w W m z m4 \w H 4. d m 1 3 ,1; 5 m V md l n/ I\ u 7 A W. W

1 z w m n m z 6 f w L H..7%/ g /.,5J Kw L 2 \x E Q #1 m m 2 v ATTORNEYS Patented July 6, 1926.

UNITED STATES FLOYD A. DEZARN, or BELL, canmomwm.

OIL SAVER.

Application filed August 11, 1925.

This invention relates to a cap structure adapted to be mounted at the top of a well casing and is designed to slidably pack a cable extending into the casing. More particularly, the present invention is. useful with a bailer or swab permitting the outflow of oil and fluid from the casing through the usual flow pipe.

- Swabbing and bailing of oil wells is practiced for the purpose of cleaning the well hole, relieving pressure within the hole, opening up channels, and stimulating the flow of gas and oil toward the well. By these operations, oil in the casing. together with water and mud is brought to the surface, sometimes starting a violent flow of oil and gas. It has been the practice to bail and swab with the upper end of the casing open, oil and mud from the hole frequently spur-ting upwardly so as to spray the derrick and surrounding objects with mud and oil. There is a resultant damage and also a loss of oil.

An object'of the present invention is to provide a head for closing the upper end of the casing while swabbing and bailing operations are carried on. Another ob ect of this invention. is to "provide a head which will be automatically released from the casing upon the bailer or swab reaching the top. Packed heads for saving oil have been provided, but they have been so constructed that they must be. released by unscrewin the head in order to bring the bailer or swa 5 out of the casing. If. the bailer or swab is pulled against the head, damage may result from the cable being broken by the strain or the threads on the head stripped. As the fbreakin of the cable is the more harmful, heads have been constructed with easily stripped threads. A- more specific object of this invention is to provide a head of the character described which will be released by the cable socket or other swell in the supporting line engaging the head and being pulled therea-gainst. In addition to the broader objects of this invention there are certain details of design, whereby an economical, durable, efiicient structure, readily placed on the casing and removed therefrom .1s obtained.

These objects together with other objects and corresponding accomplishments are obtained by means of the embodiment of my M invention illustrated in the accompanying drawing, inwhich:

Serial No. 49,549.

Fig. 1 is a vertical axial section showing the upper end of a well casing with a cable and socket therein, and my improved oil saver head mounted on the casing; Fig. 2 is a section as seen on the line 2-2 of Fig. l; and Fig. 3 is a section as seen on the line 33 of Fig. 1. g

Referring more particularly to the drawing, 5 indicates the upper end of a well casing, to which is screwed a T fitting or casing head 6. The head is provided with an outflow branch 7 adapted to be connected by suitable unions to the flow pipe. Mounted above the top of the head 6 is the oil saver dome.

The dome is splitdiametrically being formed of two sections, 8 and 9. These sections are provided at their edges with flanges 10 and 11 having registering. bolt holes to receive bolts 12 for fastening the sections together. The sections are alike except that one is a right hand member and the other a left hand member. The dome will be described as a unit, that is, fastened together. At the lower end is a nipple 13 provided with external threads whereby itmay be screwed into the head. The nipple swells. outwardly as indicated by 14 having a packing flange 15 extending outwardly provided with a groove to receive a round ring packing 16 Which is preferably of rubber. A cylindrical portion 17 is chamfered at its upper outer edge as indicated by 18 to form a seat. Extending inwardly from the upper end of the nipple is a gripping ledge 19. The dome proper has a belled lower end 20 adapted to slip overthe cylindrical end 17 of the nipple. It has a seat 21 facing the flange 15 and provided with a ,groove adapted to receive the packing ring 16.'

Intermediate the ends of the head is a chamber 22 and at the upper end is a cylindrical stalling box portion 23, through which the working cable may slidably extend. The stufiing box portion has a. borereduced in diameter at its inner end and shouldered to receive a metallic plug 24 having a bore for the cable. Hydraulic or other suitable packing is placed upon the top of the plug as indicated by 25. Mounted 'upon the top of the packing is a follower extend through the wall of recesses formed in the dome. The catches are provided with hooked ends 30 arranged to en age the ledge 19 in the nipple, and thereby dock the head to the nipple.- The upper arms of the catches extend close to and around the cable 31, at the lower end of which is a socket 32 for attachment to the swab or bailer. For the purpose of adjusting the outermost positions of the hook ends of the catches, adjustment screws 33 are mounted in the head, one for each catch. The dome is provided adjacent its upper end with lateral projections forming chambers 34 receiving plunger pins 35. These plunger pins are pressed inwardly by means of compression springs 36 so that the pins tend to move the upper ends of the catches inwardly toward one another.

In fitting the dome to a casing, the sections are brought together about the cable and bolted, gland nut 27 being screwedinwardly to expand the packing 25 to form atight fit. The nipple 13 is placed in position on the casing head, and then the swab is lowered into the casing. The dome is then forced downwardly with the bell end over the extension 17, the packing ring having been placed in position on the nipple. As the head is forced downwardly, the rounded ends of the catches ride' over and finally hook under the ledge 19. The dome is then looked to. the nipple forming a tight fit. The plunger pins 35 and springs 36 hold the catches at their upper ends in position so that slapping of the cable 31 will not result in release of the catches. In pulling the swab or bailer out of the hole, as it comes upwardly, the socket 32 will enter between the up er arms of the catches 28,

thereby sprea ing the latter and pulling the hooked ends of the catches from beneath the ledge 19. This releases the dome from the nipple, and it will be moved upwardly as the swab comes out of the hole. Replacement of the dome on the nipple is easy and it is obvious that no damage will be caused to the dome or casing by reason of the swab or bailer being moved upwardly beyond the point at which it starts to come out of the casing.

What I claim is:

1. A device of the character described comprising in combination a tubular memher adapted to be secured at the top of a casing and having an internal projection,

a dome adapted to rest against the edge of said member and form a tight joint therewith, said dome having a bore through which a cable may be slidably passed, catch levers pivotally mounted within saiddome, each lever having'a lower arm rovided with a hook adapted to be engage with said projection, the upper arms of said levers being disposed at the sides of the cable so as to be spread by a swellin on' the cable being forced therebetween c aracterized by said dome being diametrically split.

2. A device of the character described comprising a tubular member adapted to be secured at the top of a casing and having an internal projection, a dome adapted to rest against the upper edge of said member and form a tight joint therewith, said dome having a bore through which a cable may be slidably passed, catch levers pivotally mounted within said dome, each lever having a lower arm with a hook adapted to be engaged with said projection, the upper arms of said levers being disposed at the side of the cable so as to be spread by a swelling on the cable being forced therebetween, and resilient means tending to press said upper arms toward said cable characteil'ized by said dome being diametrically sp 1t.

3. A device of the character described comprising a nipple. adapted to be screwed to the top of a casing and having an internal annular ledge, a dome adapted to rest against the upper edge of said member and form a tight joint therewith, said dome having a packed bore through which a cable may slidably pass, catch levers pivotally mounted within said dome intermediate their ends, each lever having a lower arm provided with a hook with its mouth facing outwardly so as to adapt it to hook under said ledge, the upper arms of said levers being disposed at the sides of the cable so as to be spread by a swelling on the cable being forced therebetween.

4. A device as specified in claim 3 characterized by said dome being diametrically split.

In witness that I claim the foregoing I have hereunto subscribed my name this 3rd day of August, 1925.

' FLOYD A. DEZARN. 

